I've only used it a few times, so the fan inside is also in a clean condition. I was using hinoki aroma, so there is a slight scent. Replacement pads are not included, so please purchase them. They are sold for 550 yen on the official website or Amazon. https://store.at-aroma.com/item/DIF_FAN_KO_PAD.html It operates on 2 AAA batteries. It can also be operated with a micro USB cable.